Middle Eocene-Oligocene broken-foreland evolution in the Andean Calchaqui Valley, NW Argentina: Insights from stratigraphic, structural and provenance studies

Two end-member models have been proposed for the Paleogene Andean foreland: a simple W-E migrating foreland model and a broken-foreland model. We present new stratigraphic, sedimentological and structural data from the Paleogene Quebrada de los Colorados (QLC) Formation, in the Eastern Cordillera, w...

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Detalles Bibliográficos
Publicado: 2013
Materias:
basin evolution
deformation
deposition
Eocene-Oligocene boundary
foreland basin
lithostratigraphy
provenance
sedimentary basin
sedimentology
Argentina
Calchaqui Valleys
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0950091X_v25_n5_p574_DelPapa
http://hdl.handle.net/20.500.12110/paper_0950091X_v25_n5_p574_DelPapa
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_0950091X_v25_n5_p574_DelPapa
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spelling paper:paper_0950091X_v25_n5_p574_DelPapa2023-06-08T15:54:22Z Middle Eocene-Oligocene broken-foreland evolution in the Andean Calchaqui Valley, NW Argentina: Insights from stratigraphic, structural and provenance studies basin evolution deformation deposition Eocene-Oligocene boundary foreland basin lithostratigraphy provenance sedimentary basin sedimentology Argentina Calchaqui Valleys Two end-member models have been proposed for the Paleogene Andean foreland: a simple W-E migrating foreland model and a broken-foreland model. We present new stratigraphic, sedimentological and structural data from the Paleogene Quebrada de los Colorados (QLC) Formation, in the Eastern Cordillera, with which to test these two different models. Basin-wide unconformities, growthstrata and changes in provenance indicate deposition of the QLC Formation in a tectonically active basin. Both west- and east-vergent structures, rooted in the basement, controlled the deposition and distribution of the QLC Formation from the Middle Eocene to the Early Miocene. The provenance analysis indicates that the main source areas were basement blocks, like the Paleozoic Oire Eruptive Complex, uplifted during Paleogene shortening, and that delimits the eastern boundary of the present-day intraorogenic Puna plateau. A comparison of the QLC sedimentary basin-fill pattern with those of adjacent Paleogene basins in the Puna plateau and in the Santa Bárbara System highlights the presence of discrete depozones. These reflect the early compartmentalization of the foreland, rather than a stepwise advance of the deformation front of a thrust belt. The early Tertiary foreland of the southern central Andes is represented by a ca. 250-km-wide area comprising several deformation zones (Arizaro, Macón, Copalayo and Calchaquí) in which doubly vergent or asymmetric structures, rooted in the basement, were generated. Hence, classical foreland model is difficult to apply in this Paleogene basin; and our data and interpretation agree with a broken-foreland model. © 2013 John Wiley & Sons Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0950091X_v25_n5_p574_DelPapa http://hdl.handle.net/20.500.12110/paper_0950091X_v25_n5_p574_DelPapa
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic basin evolution
deformation
deposition
Eocene-Oligocene boundary
foreland basin
lithostratigraphy
provenance
sedimentary basin
sedimentology
Argentina
Calchaqui Valleys
spellingShingle basin evolution
deformation
deposition
Eocene-Oligocene boundary
foreland basin
lithostratigraphy
provenance
sedimentary basin
sedimentology
Argentina
Calchaqui Valleys
Middle Eocene-Oligocene broken-foreland evolution in the Andean Calchaqui Valley, NW Argentina: Insights from stratigraphic, structural and provenance studies
topic_facet basin evolution
deformation
deposition
Eocene-Oligocene boundary
foreland basin
lithostratigraphy
provenance
sedimentary basin
sedimentology
Argentina
Calchaqui Valleys
description Two end-member models have been proposed for the Paleogene Andean foreland: a simple W-E migrating foreland model and a broken-foreland model. We present new stratigraphic, sedimentological and structural data from the Paleogene Quebrada de los Colorados (QLC) Formation, in the Eastern Cordillera, with which to test these two different models. Basin-wide unconformities, growthstrata and changes in provenance indicate deposition of the QLC Formation in a tectonically active basin. Both west- and east-vergent structures, rooted in the basement, controlled the deposition and distribution of the QLC Formation from the Middle Eocene to the Early Miocene. The provenance analysis indicates that the main source areas were basement blocks, like the Paleozoic Oire Eruptive Complex, uplifted during Paleogene shortening, and that delimits the eastern boundary of the present-day intraorogenic Puna plateau. A comparison of the QLC sedimentary basin-fill pattern with those of adjacent Paleogene basins in the Puna plateau and in the Santa Bárbara System highlights the presence of discrete depozones. These reflect the early compartmentalization of the foreland, rather than a stepwise advance of the deformation front of a thrust belt. The early Tertiary foreland of the southern central Andes is represented by a ca. 250-km-wide area comprising several deformation zones (Arizaro, Macón, Copalayo and Calchaquí) in which doubly vergent or asymmetric structures, rooted in the basement, were generated. Hence, classical foreland model is difficult to apply in this Paleogene basin; and our data and interpretation agree with a broken-foreland model. © 2013 John Wiley & Sons Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists.
title Middle Eocene-Oligocene broken-foreland evolution in the Andean Calchaqui Valley, NW Argentina: Insights from stratigraphic, structural and provenance studies
title_short Middle Eocene-Oligocene broken-foreland evolution in the Andean Calchaqui Valley, NW Argentina: Insights from stratigraphic, structural and provenance studies
title_full Middle Eocene-Oligocene broken-foreland evolution in the Andean Calchaqui Valley, NW Argentina: Insights from stratigraphic, structural and provenance studies
title_fullStr Middle Eocene-Oligocene broken-foreland evolution in the Andean Calchaqui Valley, NW Argentina: Insights from stratigraphic, structural and provenance studies
title_full_unstemmed Middle Eocene-Oligocene broken-foreland evolution in the Andean Calchaqui Valley, NW Argentina: Insights from stratigraphic, structural and provenance studies
title_sort middle eocene-oligocene broken-foreland evolution in the andean calchaqui valley, nw argentina: insights from stratigraphic, structural and provenance studies
publishDate 2013
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0950091X_v25_n5_p574_DelPapa
http://hdl.handle.net/20.500.12110/paper_0950091X_v25_n5_p574_DelPapa
_version_ 1768543043480190976

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